rigidbodyinertia.hpp

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// Copyright  (C)  2009  Ruben Smits <ruben dot smits at mech dot kuleuven dot be>
 
// Version: 1.0
// Author: Ruben Smits <ruben dot smits at mech dot kuleuven dot be>
// Maintainer: Ruben Smits <ruben dot smits at mech dot kuleuven dot be>
// URL: http://www.orocos.org/kdl
 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
#ifndef KDL_RIGIDBODYINERTIA_HPP
#define KDL_RIGIDBODYINERTIA_HPP
 
#include "frames.hpp"
 
#include "rotationalinertia.hpp"
 
namespace KDL {
    
    class RigidBodyInertia{
    public:
        
        explicit RigidBodyInertia(double m=0, const Vector& oc=Vector::Zero(), const RotationalInertia& Ic=RotationalInertia::Zero());
        
        static inline RigidBodyInertia Zero(){
            return RigidBodyInertia(0.0,Vector::Zero(),RotationalInertia::Zero());
        };
        
        
        ~RigidBodyInertia(){};
        
        friend RigidBodyInertia operator*(double a,const RigidBodyInertia& I);
        friend RigidBodyInertia operator+(const RigidBodyInertia& Ia,const RigidBodyInertia& Ib);
        friend Wrench operator*(const RigidBodyInertia& I,const Twist& t);
        friend RigidBodyInertia operator*(const Frame& T,const RigidBodyInertia& I);
        friend RigidBodyInertia operator*(const Rotation& R,const RigidBodyInertia& I);

        RigidBodyInertia RefPoint(const Vector& p);

        double getMass() const{
            return m;
        };

        const Vector& getSpatialMomentum() const
        {
            return h;
        }

        Vector getCOG() const{
            if(m==0) return Vector::Zero();
            else return h/m;
        };

        RotationalInertia getRotationalInertia() const{
            return I;
        };
 
    private:
        RigidBodyInertia(double m,const Vector& h,const RotationalInertia& I,bool mhi);
        double m;
        Vector h;
        RotationalInertia I;
 
        friend class ArticulatedBodyInertia;
        
    };

    RigidBodyInertia operator*(double a,const RigidBodyInertia& I);
    RigidBodyInertia operator+(const RigidBodyInertia& Ia,const RigidBodyInertia& Ib);

    Wrench operator*(const RigidBodyInertia& I,const Twist& t);

    RigidBodyInertia operator*(const Frame& T,const RigidBodyInertia& I);
    RigidBodyInertia operator*(const Rotation& R,const RigidBodyInertia& I);
 
 
 
}//namespace
 
 
#endif